24 Questions
What is the characteristic of Moisturizing creams in terms of oil content?
Low oil content
What type of pH is typically found in Foundation creams?
Neutral to slightly acidic
Which type of cream is likely to be stiff and 'rich'?
Cold creams
What is the characteristic of Hand and Body creams in terms of spreadability?
Easily spreadable but do not 'rub in'
What type of emulsion is usually found in Foundation creams?
Oil-in-water emulsion
What is the purpose of surfactants in Cleansing creams?
To improve penetration and suspension properties
Which type of cream is available in both cream and lotion forms?
Hand and Body creams
What is the characteristic of Cleansing creams in terms of oil content?
Medium-to-high oil content
What is the primary reason for using non-ionic emulsifiers in beeswax-borax emulsions?
To add flexibility and stability to the emulsion
What type of emulsion is formula (1) in the content?
Water-in-oil (W/O) emulsion
Why are buffered acidic cleansing creams preferred?
They allow a more rapid return to normal skin pH
What is the purpose of 2-Night and Massage Creams?
To be left on the skin for several hours
What is the common use of triethanolamine stearate emulsifier systems?
In cleansing creams
What is the characteristic of lighter creams of the oil-in-water type?
Medium oil content
What is the common use of glyceryl stearates?
In acidic formulations
Why may phase inversion occur on the skin after application?
When the emulsion is spread onto the skin surface and the water begins to evaporate
What is the primary purpose of cleansing creams and lotions on the skin surface?
To efficiently and pleasantly remove grime and soil
What is the characteristic of cleansing creams that makes them more effective than water or soap alone?
Their ability to emulsify and suspend grime and soil
What is the term for a group of emulsions that are related to cleansing creams and are characterized by their cooling effect on the skin?
Cold creams
What is the role of borax in the formulation of cold creams?
To increase the stability of the emulsion
What is the characteristic of cleansing creams that makes them more convenient to use than soap?
Their ability to be used outside of the bathroom
What is the effect of soaps on the skin surface when used for cleansing?
They remove excess oil from the skin, leaving it dry and rough
What is the purpose of massaging the cleansing cream or lotion onto the skin surface?
To loosen and suspend the grime and soil in the emulsion
What determines the cleansing power of cleansing creams?
The concentration of the oily phase in their composition
Study Notes
Creams
- Definition: A solid or semisolid emulsion for skin application.
- Classification: Functional, subjective, and physicochemical methods.
Functional Classification
- Cleansing creams: Remove grime, sebum, dead cells, crusts, and makeup from the skin surface.
- Moisturizing creams: Low oil content, easily spreadable, and quick to absorb.
- Foundation creams: Oil-in-water emulsion, usually neutral pH.
- Vanishing creams: Oil-in-water or water-in-oil emulsion, neutral to slightly acidic pH.
- Hand and body creams: Low to medium oil content, easily spreadable, and may contain protective factors.
Cleansing Creams
- Purpose: Remove grime, sebum, dead cells, crusts, and makeup from the skin surface.
- Composition: Combination of water and oils, affecting skin cleansing efficiently and pleasantly.
- Action: Spread onto the skin, massage, and wipe with a tissue or wool pad.
- Cleansing power: Depends on the concentration of the oily phase in the composition.
- Cold creams: Inclusion of borax imparts increased stability, and phase inversion may occur on the skin after application.
Cold Creams
- Emulsifier: Beeswax-borax system, supplemented by non-ionic emulsifiers like sorbitan fatty acid esters.
- Formula: W/O emulsion (1) or O/W emulsion (2), with varying percentages of beeswax, mineral oil, lanolin, and other ingredients.
Acidic Cleansing Creams
- pH: Acidic, allowing for a more rapid return to normal skin pH.
- Emulsifiers: Fewer options available, including glyceryl stearates, cetyl or stearyl alcohols, phosphated fatty alcohols, and fatty alcohol sulphates.
Night and Massage Creams
- Designed to be left on the skin for several hours during the night.
- May be stiff and "rich" due to their oil content.
- May contain surfactants to improve penetration and suspension properties.
A lecture on skin care products focusing on the definition and classification of creams in cosmetic science. Learn about the different methods of classification.
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